Core Rule Set: Ghost's ordinary requests pass by default (closes #357)

Ghost 6.76.0's ordinary traffic, recorded in `testdata/ghost-requests.txt`,
passes at the default settings and while bodies are read. It covers public
pages, members' sign-up and sign-in, the admin, the editor saving and
publishing posts and pages with code blocks and HTML cards, tags, settings,
staff invitations, uploads, newsletter settings, and both APIs. The new
`ghost.conf`, the sixteenth change, lets through `filter`, the member
`search` and the embed `url` in the query, and plain text, addresses,
articles, code injection and passwords in JSON bodies. A `<script>` element
and a `javascript:` link stay refused in articles and code injection.
`README.md` lists Ghost; `SPEC.md` lists the change.

Model: opus-5-5

internal/coreruleset/coreruleset_test.go

@@ -204,7 +204,7 @@ func atDefaults(t *testing.T) *coreruleset.CoreRuleSet {
 }
 
 // wantChange checks that crs lets through passes, a request one of the
-// fifteen changes is for, and still finds result in refused, a request like
+// sixteen changes is for, and still finds result in refused, a request like
 // it that the change is not for.
 func wantChange(
 	t *testing.T, crs *coreruleset.CoreRuleSet, passes, refused request,